Chemical interaction motivated structure design of layered metal carbonate hydroxide/MXene composites for fast and durable lithium ion storage

• 作者: Huibin Guan Hanna He Tianbiao Zeng Chuhong Zhang
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（12）
• 页码范围: 633-641
• 页数: 9页
• 语种: 英文

摘要

Rational architecture design has turned out to be an effective strategy in improving the electrochemical performance of electrode materials for batteries.However,an elaborate structure that could simultane-ously endow active materials with promoted reaction reversibility,accelerated kinetic and restricted vol-ume change still remains a huge challenge.Herein,a novel chemical interaction motivated structure design strategy has been proposed,and a chemically bonded Co(CO3)0.5OH.0.11H2O@MXene(CoCH@MXene) layered-composite was fabricated for the first time.In such a composite,the chemical interaction between Co2+ and MXene drives the growth of smaller-sized CoCH crystals and the subse-quent formation of interwoven CoCH wires sandwiched in-between MXene nanosheets.This unique lay-ered structure not only encourages charge transfer for faster reaction dynamics,but buffers the volume change of CoCH during lithiation-delithiation process,owing to the confined crystal growth between con-ductive MXene layers with the help of chemical bonding.Besides,the sandwiched interwoven CoCH wires also prevent the stacking of MXene layers,further conducive to the electrochemical performance of the composite.As a result,the as-prepared CoCH@MXene anode demonstrates a high reversible capac-ity (903.1 mAh g-1 at 100 mA g-1) and excellent cycling stability (maintains 733.6 mAh g-1 at 1000 mA g-1 after 500 cycles) for lithium ion batteries.This work highlights a novel concept of layer-by-layer chemical interaction motivated architecture design for futuristic high performance electrode materials in energy storage systems.